Stroke old 340 or new crate engine

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It's a prostreet duster with 21.5x33 mt's. It has manual brakes and steering no heat or wipers. Im not overly concerned about daily drivability as we mainly cruise it to shows. This may sound lame but it needs to look and sound the part. It sounds the part now but performance is poor.
I dare you to describe " poor" .. That car with 400 honest horsepower, should run 11's .. I call it ,good.
What a beautiful Duster....